I have a .35 rem Marlin 336. I love it and it is my "go to" for close range/brush hunting. Not sure what type of yardage you hunt but if you plan on shooting much over 100 yards your better off with the .260 idea. Not saying the .35 wont shoot past that, deer have been killed with .35's at 300 yards (not by me though) but there is a large difference in velocity and trajectory between the .35 and .260 that will really start to show past 100 yards. The .260 will serve alot better than the .35 as a "do all" hunting rifle.
BTW- the .260 rem is older, wiser and better than the 6.5 creedmore